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This section provides an overview for junction boxes as well as their applications and principles. Also, please take a look at the list of 0 junction box manufacturers and their company rankings.
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Engaged in research on nitride semiconductor growth using the MBE method at Waseda University Graduate School. After graduating from graduate school in 2016, he joined a non-ferrous metal manufacturer.
Engaged in equipment maintenance and engineering work at metal smelting plants. Moved to a chemical manufacturer in 2022. Engaging in similar tasks.
A junction box is a box that protects the cable ties when connecting cables.
It is used for electrical work. The technical standard for electrical equipment stipulates that the facility should be designed so that the charging part of the cable to be energized is not exposed. Therefore, connections of cables used at low voltage are generally protected with heat-shrinkable tubing or vinyl tape.
Junction boxes are used to prevent people from accidentally touching these connections and to improve their appearance.
The following are examples of locations where junction boxes are used:
Junction boxes are rarely used in homes because electrical wiring is generally housed inside walls. You may see them in commercial and public facilities.
Some junction boxes provide wiring protection with a simple cover, while others include terminals and lids.
A junction box consists of a main body, a lid, and an entry port.
The main body can be made of either resin, often using vinyl chloride, or metal, mainly using iron. Milky white or rat color is used, and a junction box of a similar color to the exterior is basically selected to make it inconspicuous. In the case of metal, products plated with hot-dip zinc are also available for corrosion resistance.
The lid is screwed to the main body. Screws made of steel are used even for plastic junction boxes.
Openings are provided on one or all of the four sides of the main body for cable entry. Wiring is not directly put into the cable entry opening but rather it is passed inside the box by connecting a capacitor or conduit.
There are various types of junction boxes, such as plastic, metal, explosion-proof, and relay boxes with terminals.
This is a junction box exclusively for VVF. These are VVF-specific junction boxes that pierce and connect VVF wires and are generally made of resin.
These are junction boxes used in various places, such as factories and outdoors. They are used by connecting thin steel pipes, VE pipes, or other conduit pipes to the entry ports. It serves as a relay point for cables passing through conduit pipes, where the cables are connected, branched inside the box, and then rerouted through conduit pipes to different locations.
Products that are drip-proof and can be used outdoors are available, as well as products with multiple terminals for easy change of wiring and branching.
They are used in combination with thick steel conduit pipes, etc. Explosion-proof construction is used in flammable gas atmospheres, etc., and is a sealed construction used to prevent ignition by electricity. It is mainly used in chemical plants and hazardous material storage facilities where ignition is a concern.
It has a sturdy structure, and wire entry is done by a packing-type cable gland with explosion-proof packing. The lid and other open/close parts are also sealed with packing.
A round exposed box is a round junction box. It is also called a round box. It is widely used for remodeling, factory wiring, etc. The lid and body are generally screwed together at two points, top and bottom.
Round exposed boxes are standardized by some standards and are smaller in volume than pull boxes and other types of boxes. Therefore, they are used for relatively small-scale wiring connections. The lower part of the box may be opened on all four sides without wire entry and used as a drainage hole.
Junction boxes are selected in terms of type, size, and color. There are many types available as described above, and they should be selected according to the intended use. In general, there is no set rule, so select a type that is easy to use. However, an explosion-proof Junction Box is always required in explosion-proof areas.
If a pull box or other type of box is selected, it can be of various sizes. In general, the larger the number of cores, the more wiring connections to be stored, so a large Junction Box should be selected. The color should be selected to blend in with the surrounding color. If the required color is not available, painting is required separately.
*Including some distributors, etc.
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49 products found
49 products
September International Co., Ltd.
290+ people viewing
This is a bullet type camera fixing joint box that we handle construction and installation. *Appearance and specifications are subject to change w...
2 models listed
IDEC Co., Ltd.
560+ people viewing
Last viewed: 1 hour ago
Very Fast Response
■Explosion-proof performance Ex eIIT6 ■Features - Conforms to revised technical standards and can be used in Zone 1 and Zone 2. ・Uses stainless s...
Bee & Plus Co., Ltd.
540+ people viewing
Last viewed: 21 hours ago
Standard Response
■ Overview ・ Switch signal: Signal such as melee sensors and optical electricity sensors is transmitted. ・ Switch signal transmission -terminal b...
4 models listed
Takachi Electric Industry Co., Ltd.
110+ people viewing
■Features - IP68 highly waterproof plastic box that can withstand submersion at a depth of 1 meter for 24 hours. - Made of ASA resin that is resist...
Kashiwagi Kosan Co., Ltd.
100+ people viewing
Last viewed: 18 hours ago
■Product features ・A pipeline with a flexible structure is constructed. ・Vertical tightening work, joint work, and flexible joint work are not re...
Mibu Electric Manufacturing Co., Ltd.
80+ people viewing
■Directly imported from German WISKA company ・Made of polypropylene and halogen-free ・Capacity is increased by 10% by using a dome-shaped cover ...
KCC Shokai Co., Ltd.
80+ people viewing
Wisker's well-proven junction box COMBI series best meets the needs of our customers with its high-quality specialized resin and unique design. The...
KCC Shokai Co., Ltd.
90+ people viewing
■Extensibility of COMBI series The new COMBI407 complements the famous Whisker junction box COMBI series, offering quick installation, cost savings...
Nippon Weidmuller Co., Ltd.
90+ people viewing
Last viewed: 1 day ago
■Modified and assembled enclosure For over 50 years, Klippon® has been synonymous with innovation, capability and quality of automation technology ...
K-B Device Co., Ltd.
80+ people viewing
Last viewed: 4 hours ago
Very Fast Response
Ito Electric Manufacturing Co., Ltd.
80+ people viewing
Last viewed: 1 day ago
2 models listed
Solid Co., Ltd.
40+ people viewing
◼︎Overview -The camera's power adapter does not fit into the junction box. ・Please purchase the mounting clamp separately according to the pole yo...
Toyama Electric Co., Ltd.
90+ people viewing
Last viewed: 16 hours ago
Very Fast Response
This is a branch box used when connecting electric wires.
Daiwa Engineering Co., Ltd.
60+ people viewing
Last viewed: 13 hours ago
